【100以内合数有哪些】在数学中，自然数根据因数的多少可以分为质数、合数和1。其中，质数是指只有两个正因数（1和它本身）的数，而合数则是除了1和它本身之外还有其他因数的数。1既不是质数也不是合数。
在1到100之间，除了质数和1以外的数都是合数。为了更清晰地了解哪些数是合数，我们可以列出100以内的所有合数，并通过表格进行直观展示。
100以内合数列表（按顺序排列）
| 序号 | 合数 | 因数说明 |
| 1 | 4 | 1, 2, 4 |
| 2 | 6 | 1, 2, 3, 6 |
| 3 | 8 | 1, 2, 4, 8 |
| 4 | 9 | 1, 3, 9 |
| 5 | 10 | 1, 2, 5, 10 |
| 6 | 12 | 1, 2, 3, 4, 6, 12 |
| 7 | 14 | 1, 2, 7, 14 |
| 8 | 15 | 1, 3, 5, 15 |
| 9 | 16 | 1, 2, 4, 8, 16 |
| 10 | 18 | 1, 2, 3, 6, 9, 18 |
| 11 | 20 | 1, 2, 4, 5, 10, 20 |
| 12 | 21 | 1, 3, 7, 21 |
| 13 | 22 | 1, 2, 11, 22 |
| 14 | 24 | 1, 2, 3, 4, 6, 8, 12, 24 |
| 15 | 25 | 1, 5, 25 |
| 16 | 26 | 1, 2, 13, 26 |
| 17 | 27 | 1, 3, 9, 27 |
| 18 | 28 | 1, 2, 4, 7, 14, 28 |
| 19 | 30 | 1, 2, 3, 5, 6, 10, 15, 30 |
| 20 | 32 | 1, 2, 4, 8, 16, 32 |
| 21 | 33 | 1, 3, 11, 33 |
| 22 | 34 | 1, 2, 17, 34 |
| 23 | 35 | 1, 5, 7, 35 |
| 24 | 36 | 1, 2, 3, 4, 6, 9, 12, 18, 36 |
| 25 | 38 | 1, 2, 19, 38 |
| 26 | 39 | 1, 3, 13, 39 |
| 27 | 40 | 1, 2, 4, 5, 8, 10, 20, 40 |
| 28 | 42 | 1, 2, 3, 6, 7, 14, 21, 42 |
| 29 | 44 | 1, 2, 4, 11, 22, 44 |
| 30 | 45 | 1, 3, 5, 9, 15, 45 |
| 31 | 46 | 1, 2, 23, 46 |
| 32 | 48 | 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 |
| 33 | 49 | 1, 7, 49 |
| 34 | 50 | 1, 2, 5, 10, 25, 50 |
| 35 | 51 | 1, 3, 17, 51 |
| 36 | 52 | 1, 2, 4, 13, 26, 52 |
| 37 | 54 | 1, 2, 3, 6, 9, 18, 27, 54 |
| 38 | 55 | 1, 5, 11, 55 |
| 39 | 56 | 1, 2, 4, 7, 8, 14, 28, 56 |
| 40 | 57 | 1, 3, 19, 57 |
| 41 | 58 | 1, 2, 29, 58 |
| 42 | 60 | 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 |
| 43 | 62 | 1, 2, 31, 62 |
| 44 | 63 | 1, 3, 7, 9, 21, 63 |
| 45 | 64 | 1, 2, 4, 8, 16, 32, 64 |
| 46 | 65 | 1, 5, 13, 65 |
| 47 | 66 | 1, 2, 3, 6, 11, 22, 33, 66 |
| 48 | 68 | 1, 2, 4, 17, 34, 68 |
| 49 | 69 | 1, 3, 23, 69 |
| 50 | 70 | 1, 2, 5, 7, 10, 14, 35, 70 |
| 51 | 72 | 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 |
| 52 | 74 | 1, 2, 37, 74 |
| 53 | 75 | 1, 3, 5, 15, 25, 75 |
| 54 | 76 | 1, 2, 4, 19, 38, 76 |
| 55 | 77 | 1, 7, 11, 77 |
| 56 | 78 | 1, 2, 3, 6, 13, 26, 39, 78 |
| 57 | 80 | 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 |
| 58 | 81 | 1, 3, 9, 27, 81 |
| 59 | 82 | 1, 2, 41, 82 |
| 60 | 84 | 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 |
| 61 | 85 | 1, 5, 17, 85 |
| 62 | 86 | 1, 2, 43, 86 |
| 63 | 87 | 1, 3, 29, 87 |
| 64 | 88 | 1, 2, 4, 8, 11, 22, 44, 88 |
| 65 | 90 | 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 |
| 66 | 91 | 1, 7, 13, 91 |
| 67 | 92 | 1, 2, 4, 23, 46, 92 |
| 68 | 93 | 1, 3, 31, 93 |
| 69 | 94 | 1, 2, 47, 94 |
| 70 | 95 | 1, 5, 19, 95 |
| 71 | 96 | 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 |
| 72 | 98 | 1, 2, 7, 14, 49, 98 |
| 73 | 99 | 1, 3, 9, 11, 33, 99 |
| 74 | 100 | 1, 2, 4, 5, 10, 20, 25, 50, 100 |
总结
在1到100之间的数字中，合数共有 74个，它们是除了1和所有质数以外的其余数字。理解合数的概念有助于我们更好地掌握数的分解与因数分析，在数学学习中具有重要意义。